1. Department of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London E1 4NS, UK
2. Department of Engineering and Applied Science, Aston University, Aston Triangle, Birmingham B4 7ET, UK
3. Computational Science, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
4. National Research University ITMO, Kronverkskiy Prospekt 49, 197101 St Petersburg, Russia
5. Computer Science Department, University of Geneva, 1211 Geneva 4, Switzerland
6. Centre for Computational Science, University College London, 20 Gordon Street, London WC1H OAJ, UK